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mm/page_alloc: simplify lowmem_reserve max calculation

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Use max() to find the maximum lowmem_reserve value and min_t() to cap it
to managed_pages in calculate_totalreserve_pages(), instead of open-coding
the comparisons.  No functional change.

[liuye@kylinos.cn: fix layout, use min_t]
  Link: https://lkml.kernel.org/r/20250815024509.37900-1-ye.liu@linux.dev
Link: https://lkml.kernel.org/r/20250814090053.22241-1-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ye Liu
2025-08-14 17:00:52 +08:00
committed by Andrew Morton
parent a3f451ad33
commit 0c04015d45
1 changed files with 3 additions and 6 deletions
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mm/page_alloc.c
+3 -6
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@@ -6236,16 +6236,13 @@ static void calculate_totalreserve_pages(void)
unsigned long managed_pages = zone_managed_pages(zone);
/* Find valid and maximum lowmem_reserve in the zone */
for (j = i; j < MAX_NR_ZONES; j++) {
if (zone->lowmem_reserve[j] > max)
max = zone->lowmem_reserve[j];
}
for (j = i; j < MAX_NR_ZONES; j++)
max = max(max, zone->lowmem_reserve[j]);
/* we treat the high watermark as reserved pages. */
max += high_wmark_pages(zone);
if (max > managed_pages)
max = managed_pages;
max = min_t(unsigned long, max, managed_pages);
pgdat->totalreserve_pages += max;